diff --git a/frontend/src/components/calendar/MiniCalendar.tsx b/frontend/src/components/calendar/MiniCalendar.tsx
index 39ec6ab..ca04921 100644
--- a/frontend/src/components/calendar/MiniCalendar.tsx
+++ b/frontend/src/components/calendar/MiniCalendar.tsx
@@ -44,14 +44,15 @@ const MiniCalendar = memo(function MiniCalendar({
   );
   const [selectedDate, setSelectedDate] = useState<string | null>(null);
 
-  // Sync displayed month when main calendar navigates across months
-  // selectedDate is only set by user clicks in the mini calendar, not by external navigation
+  // Sync displayed month when main calendar navigates (toolbar prev/next/today)
+  // Also clear selected date — avoids stale highlight after "Today" click
   useEffect(() => {
     if (!currentDate) return;
     const incoming = startOfMonth(parseDate(currentDate));
     setDisplayedMonth((prev) =>
       prev.getTime() === incoming.getTime() ? prev : incoming
     );
+    setSelectedDate(null);
   }, [currentDate, parseDate]);
 
   const days = useMemo(